how to start the 220KW ac induction motor?answers please……..

[rafi201]

Dear Engineers,

 

How to start a 220KW ac induction motor by using AC DRIVES TO REDUCE POWER CONSUMPTION?

1.Are they any AC drives?please mention their price and specifications?

[Spir Georges GHALI]

rafi201 said:

Dear Engineers,

 

How to start a 220KW ac induction motor by using AC DRIVES TO REDUCE POWER CONSUMPTION?

1.Are they any AC drives?please mention their price and specifications?

---

Dear Rafi ;

 

Certainly, there's a Variable Speed Drive for even more than 220kW, I will mention below the references for ” Schneider Electric ” :

 

– ATV61HC22N4 : the transient torque for this VSD is ” 120 … 130% “ of the nominal torque for 60 seconds

– ATV71HC25N4 : the transiant torque for this VSD is ” 170% “ of the nominal torque for 60 seconds, and ” 220% “ for 2 seconds

 

So, depending on your application if you need standard or high torque you can do the choice. Noting that for each one there's many options that you can add.

 

For the unit price, you can ask the Schneider Electric office or any distributors for them in your country.

 

Rem. : if you need more information about them please send me an e-mail at  hagersg@aloola.sy 

 

Regards.

[rafi201]

Spir Georges GHALI said:

rafi201 said:

Dear Engineers,

 

How to start a 220KW ac induction motor by using AC DRIVES TO REDUCE POWER CONSUMPTION?

1.Are they any AC drives?please mention their price and specifications?

---

Dear Rafi ;

 

Certainly, there's a Variable Speed Drive for even more than 220kW, I will mention below the references for ” Schneider Electric ” :

 

– ATV61HC22N4 : the transient torque for this VSD is ” 120 … 130% “ of the nominal torque for 60 seconds

– ATV71HC25N4 : the transiant torque for this VSD is ” 170% “ of the nominal torque for 60 seconds, and ” 220% “ for 2 seconds

 

So, depending on your application if you need standard or high torque you can do the choice. Noting that for each one there's many options that you can add.

 

For the unit price, you can ask the Schneider Electric office or any distributors for them in your country.

 

Rem. : if you need more information about them please send me an e-mail at  hagersg@aloola.sy 

 

Regards.

---

Dear Sir,

thank you very much for your reply.

 

and i have one more question….

we have a 220kw motor in our crusher plant….when it runs on load it takes 500A …k thats fine..but the problem is the motor will not run contineously on load.it runs minimum 3-5 hours idle(that is on no load)…On no load it takes ol drives -200Amps.it means the idle hours  running is increasing the electricity bill…..

now my idea is i want to put some speed control drives when it runs on no load(no feed of material)…

can we have speed control drives for this?

shall we reduce the no load amps by fixing ac drives?

         i hope u understood my problem…………please give me suggestion…………………thank u sir

[Spir Georges GHALI]

Dear Rafi ;

 

I understand your situation, and accordingly to your application, I want to draw your attention to the following :

1 – If the motor consumes at full load around ” 500A ” it's certainly ” Over-Loaded “, because his nominal current should be around ” 375A ” if ” Cos φ = 0.85 “

2 – If the motor on no load consumes around ” 200A ” that means there's a load but not full, because this kind of motor should consume without any load around ” 8-10% ” of his nominal current.

3 – For this kind of application, you should use ” ATV71HC25N4 “, but be attention of the VSD Thermal Protection that will trip if it's adjusted exactly at the motor's nominal current.

4 – If the motor runs idle ( with the minimum load ) on the same nominal speed ( nominal rpm ), by using a VSD the benefit will be moderate, but if you have the possibility to reduce the speed when it runs idle you will have more benefit.

[rafi201]

THANK YOU SIR…………I WILL INFORM THIS TO MY SENIOR ENGINEEER AND WILL SEE THE RESULT

 

THANK YOU SIR

[rafi201]

SIR GIVE ME SOME MORE ELECTRICLA TIPS FOR REDUCING OPERATIONAL COST OF THE PLANT FROM UR EXPERIENCE…………………

[Spir Georges GHALI]

rafi201 said:

SIR GIVE ME SOME MORE ELECTRICLA TIPS FOR REDUCING OPERATIONAL COST OF THE PLANT FROM UR EXPERIENCE…………………

---

Dear Rafi ;

 

To reduce the operational cost for any plant, all information about the plant should be known with the single line diagram, and even the working and timing system and of the plant, then a special study will be done to define where we can reduce and what equipments should be used. Noting that there's special companies that can do this study.

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